Adjuntos desde binario

lib/api_web/controllers/attachment_controller.ex

@@ -6,23 +6,62 @@ defmodule ApiWeb.AttachmentController do
 
   def index(conn, params) do
     decode = """
-    SELECT convert_from(decrypt(decode('#{params["idstudyattachment"]}', 'hex')::bytea, '1nf0rm3'::bytea, 'aes'), 'UTF8');
+    SELECT convert_from(
+      decrypt(decode('#{params["idstudyattachment"]}', 'hex')::bytea, '1nf0rm3'::bytea, 'aes'),
+      'UTF8'
+    );
     """
-    idstudyattachment = Repo.query!(decode).rows |> hd() |> hd()
-    idstudyattachment = String.to_integer(idstudyattachment)
+
+    idstudyattachment =
+      Repo.query!(decode).rows
+      |> hd()
+      |> hd()
+      |> String.to_integer()
 
     [attachment | _] = get_attachment(idstudyattachment)
     Logger.info("Adjunto: #{inspect(attachment)}")
 
-    file_path = attachment[:path]
-    if File.exists?(file_path) do
-      conn
-      |> put_resp_content_type("application/#{attachment[:format]}")
-      |> put_resp_header("content-disposition", "inline; filename=#{attachment[:fullname]}")
-      |> send_file(200, file_path)
-    else
-      conn
-      |> send_resp(404, "File not found")
+    case attachment do
+      # Caso 1: archivo en filesystem
+      %{path: path} when not is_nil(path) ->
+        if File.exists?(path) do
+          conn
+          |> put_resp_content_type("application/#{attachment[:format]}")
+          |> put_resp_header("content-disposition", "inline; filename=#{attachment[:fullname]}")
+          |> send_file(200, path)
+        else
+          conn |> send_resp(404, "File not found")
+        end
+
+      # Caso 2: archivo en S3 (zip → redirige)
+      %{s3_path: s3_path, format: "zip"} when not is_nil(s3_path) ->
+        conn |> redirect(external: s3_path)
+
+      # Caso 3: archivo en S3 (otros formatos → preview o descarga)
+      %{s3_path: s3_path} when not is_nil(s3_path) ->
+        redirect_or_preview(conn, s3_path, attachment[:fullname])
+
+      # Caso 4: ni path ni s3_path → usar campo attachment (bytea)
+      %{path: nil, s3_path: nil, attachment: bin} when not is_nil(bin) ->
+        content_type = content_type_for(attachment[:format])
+        disposition =
+          if content_type == "application/octet-stream" do
+            "attachment"
+          else
+            "inline"
+          end
+
+        conn
+        |> put_resp_content_type(content_type)
+        |> put_resp_header(
+          "content-disposition",
+          "#{disposition}; filename=#{attachment[:fullname]}"
+        )
+        |> send_resp(200, bin)
+
+      # Caso default
+      _ ->
+        conn |> send_resp(400, "Invalid attachment")
     end
   end
 
@@ -37,6 +76,67 @@ defmodule ApiWeb.AttachmentController do
           format: sa.format,
           fullname: fragment("concat(name, '.', format)")
         }
+
     Repo.all(query)
   end
+
+  defp redirect_or_preview(conn, path, fullname) do
+    case HTTPoison.get(path, [], [follow_redirect: false, hackney: [pool: :default]]) do
+      {:ok, %HTTPoison.Response{status_code: 302, headers: headers}} ->
+        handle_redirect(conn, headers, fullname)
+
+      {:ok, %HTTPoison.Response{status_code: 200, body: body, headers: file_headers}} ->
+        preview_attachment(conn, body, file_headers, fullname)
+
+      {:error, reason} ->
+        Logger.error("Error al obtener el adjunto: #{inspect(reason)}")
+        conn |> send_resp(404, "File not found")
+    end
+  end
+
+  defp handle_redirect(conn, headers, fullname) do
+    case List.keyfind(headers, "location", 0) do
+      {"location", redirected_url} ->
+        Logger.info("Redirigiendo a: #{redirected_url}")
+
+        case HTTPoison.get(redirected_url, [], [follow_redirect: true]) do
+          {:ok, %HTTPoison.Response{status_code: 200, body: body, headers: file_headers}} ->
+            preview_attachment(conn, body, file_headers, fullname)
+
+          {:error, reason} ->
+            Logger.error("Error al descargar el adjunto tras redirección: #{inspect(reason)}")
+            conn |> send_resp(404, "File not found")
+        end
+
+      _ ->
+        Logger.error("Redirección sin ubicación válida.")
+        conn |> send_resp(404, "File not found")
+    end
+  end
+
+  defp preview_attachment(conn, body, file_headers, fullname) do
+    content_type = get_content_type(file_headers)
+
+    conn
+    |> put_resp_content_type(content_type)
+    |> put_resp_header("content-disposition", "inline; filename=#{fullname}")
+    |> send_resp(200, body)
+  end
+
+  defp get_content_type(headers) do
+    case List.keyfind(headers, "content-type", 0) do
+      {"content-type", content_type} -> content_type
+      _ -> "application/octet-stream"
+    end
+  end
+
+  defp content_type_for(format) do
+    case String.downcase(format || "") do
+      "pdf" -> "application/pdf"
+      "jpg" -> "image/jpeg"
+      "jpeg" -> "image/jpeg"
+      "png" -> "image/png"
+      _ -> "application/octet-stream"
+    end
+  end
 end